<script setup lang='ts'>
import type { Ref } from 'vue'
import { computed, onMounted, onUnmounted, ref } from 'vue'
import { useRoute } from 'vue-router'
import { storeToRefs } from 'pinia'
import { NAutoComplete, NButton, NInput, NSelect, useDialog, useMessage } from 'naive-ui'
import html2canvas from 'html2canvas'
import axios from 'axios'
import { Message } from './components'
import { useScroll } from './hooks/useScroll'
import { useChat } from './hooks/useChat'
import { useUsingContext } from './hooks/useUsingContext'
import HeaderComponent from './components/Header/index.vue'
import { HoverButton, SvgIcon } from '@/components/common'
import { useBasicLayout } from '@/hooks/useBasicLayout'
import { useChatStore, usePromptStore } from '@/store'
import { fetchChatAPIProcess, postChat, postInsertHistory } from '@/api'
import { t } from '@/locales'
import { ChatLayout } from '@/views/pdf/chat/layout'

let controller = new AbortController()

const openLongReply = import.meta.env.VITE_GLOB_OPEN_LONG_REPLY === 'true'

const route = useRoute()
const dialog = useDialog()
const ms = useMessage()

const chatStore = useChatStore()
const modelname = ref<string>('chatglm3-6b')
const options = [
  {
    value: 'MedicalGPT',
    label: 'MedicalGPT',
  },
  {
    value: 'chatglm3-6b',
    label: 'chatglm3-6b',
  },
  {
    value: 'chatpdf',
    label: 'chatpdf',
  },
]

const { isMobile } = useBasicLayout()
const { addChat, updateChat, updateChatSome, getChatByUuidAndIndex } = useChat()
const { scrollRef, scrollToBottom, scrollToBottomIfAtBottom } = useScroll()
const { usingContext, toggleUsingContext } = useUsingContext()

const { mode, uuid } = route.params as { mode: string; uuid: string }

const dataSources = computed(() => chatStore.getChatByUuid(+uuid))
const conversationList = computed(() => dataSources.value.filter(item => (!item.inversion && !!item.conversationOptions)))

const prompt = ref<string>('')
const loading = ref<boolean>(false)
const inputRef = ref<Ref | null>(null)

// 添加PromptStore
const promptStore = usePromptStore()

// 使用storeToRefs，保证store修改后，联想部分能够重新渲染
const { promptList: promptTemplate } = storeToRefs<any>(promptStore)

// 未知原因刷新页面，loading 状态不会重置，手动重置
dataSources.value.forEach((item, index) => {
  if (item.loading)
    updateChatSome(+uuid, index, { loading: false })
})

const handleClick = () => {
  // eslint-disable-next-line no-alert
  alert('button click')
}

function handleSubmit() {
  console.log(chatStore)
  onConversation()
}

async function onConversation() {
  const message = prompt.value

  if (loading.value)
    return

  if (!message || message.trim() === '')
    return

  controller = new AbortController()

  addChat(
    mode,
    +uuid,
    {
      dateTime: new Date().toLocaleString(),
      text: message,
      inversion: true,
      error: false,
      conversationOptions: null,
      requestOptions: { prompt: message, options: null },
    },
  )
  const userid = 111
  const date = new Date()
  const topic = 'test'
  postInsertHistory(userid, 'user', message, topic, date)
  scrollToBottom()

  loading.value = true
  prompt.value = ''

  let options: Chat.ConversationRequest = {}
  const lastContext = conversationList.value[conversationList.value.length - 1]?.conversationOptions

  if (lastContext && usingContext.value)
    options = { ...lastContext }

  addChat(
    mode,
    +uuid,
    {
      dateTime: new Date().toLocaleString(),
      text: t('chat.thinking'),
      loading: true,
      inversion: false,
      error: false,
      conversationOptions: null,
      requestOptions: { prompt: message, options: { ...options } },
    },
  )
  scrollToBottom()

  try {
    // const postData = {
    //   // signal: {}, // 这里需要根据实际情况创建一个合适的AbortSignal对象
    //   query: message, // 使用函数参数
    //   history_len: -1, // 默认值或根据需要设置
    //   history: [], // 默认为空数组或根据需要填充
    //   conversation_id: '1', // 默认值或根据需要设置
    //   stream: false, // 默认值
    //   model_name: 'chatglm3-6b', // 默认值或根据需要设置
    //   temperature: 0.7, // 默认值
    //   max_tokens: 0, // 默认值
    //   prompt_name: 'default', // 默认值
    // }
    let chatResponse
    if (modelname.value != 'chatpdf') {
      const response = await postChat(message, modelname.value)
      chatResponse = response
    }
    else {
      const data = { message }
      const response = await axios.post('http://127.0.0.1:8088/knowledge_base_chat', data)
      chatResponse = response.data // 存储响应的数据部分，而不是完整的响应对象
    }
    console.log(chatResponse)
    const responseAsString = JSON.stringify(chatResponse) as string
    const userid = 111
    const date = new Date()
    const topic = 'test'
    postInsertHistory(userid, 'chatglm', responseAsString, topic, date)
    updateChat(
      +uuid,
      dataSources.value.length - 1,
      {
        dateTime: new Date().toLocaleString(),
        text: chatResponse,
        loading: false,
        inversion: false,
        error: false,
        conversationOptions: null,
        requestOptions: { prompt: message, options: { ...options } },
      },
    )
  }
  catch (error: any) {
    const errorMessage = error?.message ?? t('common.wrong')

    if (error.message === 'canceled') {
      updateChatSome(
        +uuid,
        dataSources.value.length - 1,
        {
          loading: false,
        },
      )
      scrollToBottomIfAtBottom()
      return
    }

    const currentChat = getChatByUuidAndIndex(+uuid, dataSources.value.length - 1)

    if (currentChat?.text && currentChat.text !== '') {
      updateChatSome(
        +uuid,
        dataSources.value.length - 1,
        {
          text: `${currentChat.text}\n[${errorMessage}]`,
          error: false,
          loading: false,
        },
      )
      return
    }
  }
  finally {
    loading.value = false
  }

  updateChat(
    +uuid,
    dataSources.value.length - 1,
    {
      dateTime: new Date().toLocaleString(),
      text: chatResponse.data.text,
      loading: false,
      inversion: false,
      error: false,
      conversationOptions: null,
      requestOptions: { prompt: message, options: { ...options } },
    },
  )
}

async function onRegenerate(index: number) {
  if (loading.value)
    return

  controller = new AbortController()

  const { requestOptions } = dataSources.value[index]

  let message = requestOptions?.prompt ?? ''

  let options: Chat.ConversationRequest = {}

  if (requestOptions.options)
    options = { ...requestOptions.options }

  loading.value = true

  updateChat(
    +uuid,
    index,
    {
      dateTime: new Date().toLocaleString(),
      text: '',
      inversion: false,
      error: false,
      loading: true,
      conversationOptions: null,
      requestOptions: { prompt: message, options: { ...options } },
    },
  )

  try {
    let lastText = ''
    const fetchChatAPIOnce = async () => {
      await fetchChatAPIProcess<Chat.ConversationResponse>({
        prompt: message,
        options,
        signal: controller.signal,
        onDownloadProgress: ({ event }) => {
          const xhr = event.target
          const { responseText } = xhr
          // Always process the final line
          const lastIndex = responseText.lastIndexOf('\n', responseText.length - 2)
          let chunk = responseText
          if (lastIndex !== -1)
            chunk = responseText.substring(lastIndex)
          try {
            const data = JSON.parse(chunk)
            updateChat(
              +uuid,
              index,
              {
                dateTime: new Date().toLocaleString(),
                text: lastText + (data.text ?? ''),
                inversion: false,
                error: false,
                loading: true,
                conversationOptions: { conversationId: data.conversationId, parentMessageId: data.id },
                requestOptions: { prompt: message, options: { ...options } },
              },
            )

            if (openLongReply && data.detail.choices[0].finish_reason === 'length') {
              options.parentMessageId = data.id
              lastText = data.text
              message = ''
              return fetchChatAPIOnce()
            }
          }
          catch (error) {
            //
          }
        },
      })
      updateChatSome(+uuid, index, { loading: false })
    }
    await fetchChatAPIOnce()
  }
  catch (error: any) {
    if (error.message === 'canceled') {
      updateChatSome(
        +uuid,
        index,
        {
          loading: false,
        },
      )
      return
    }

    const errorMessage = error?.message ?? t('common.wrong')

    updateChat(
      +uuid,
      index,
      {
        dateTime: new Date().toLocaleString(),
        text: errorMessage,
        inversion: false,
        error: true,
        loading: false,
        conversationOptions: null,
        requestOptions: { prompt: message, options: { ...options } },
      },
    )
  }
  finally {
    loading.value = false
  }
}

function handleExport() {
  if (loading.value)
    return

  const d = dialog.warning({
    title: t('chat.exportImage'),
    content: t('chat.exportImageConfirm'),
    positiveText: t('common.yes'),
    negativeText: t('common.no'),
    onPositiveClick: async () => {
      try {
        d.loading = true
        const ele = document.getElementById('image-wrapper')
        const canvas = await html2canvas(ele as HTMLDivElement, {
          useCORS: true,
        })
        const imgUrl = canvas.toDataURL('image/png')
        const tempLink = document.createElement('a')
        tempLink.style.display = 'none'
        tempLink.href = imgUrl
        tempLink.setAttribute('download', 'chat-shot.png')
        if (typeof tempLink.download === 'undefined')
          tempLink.setAttribute('target', '_blank')

        document.body.appendChild(tempLink)
        tempLink.click()
        document.body.removeChild(tempLink)
        window.URL.revokeObjectURL(imgUrl)
        d.loading = false
        ms.success(t('chat.exportSuccess'))
        Promise.resolve()
      }
      catch (error: any) {
        ms.error(t('chat.exportFailed'))
      }
      finally {
        d.loading = false
      }
    },
  })
}

function handleDelete(index: number) {
  if (loading.value)
    return

  dialog.warning({
    title: t('chat.deleteMessage'),
    content: t('chat.deleteMessageConfirm'),
    positiveText: t('common.yes'),
    negativeText: t('common.no'),
    onPositiveClick: () => {
      chatStore.deleteChatByUuid(+uuid, index)
    },
  })
}

function handleClear() {
  if (loading.value)
    return

  dialog.warning({
    title: t('chat.clearChat'),
    content: t('chat.clearChatConfirm'),
    positiveText: t('common.yes'),
    negativeText: t('common.no'),
    onPositiveClick: () => {
      chatStore.clearChatByUuid(+uuid)
    },
  })
}

function handleEnter(event: KeyboardEvent) {
  if (!isMobile.value) {
    if (event.key === 'Enter' && !event.shiftKey) {
      event.preventDefault()
      handleSubmit()
    }
  }
  else {
    if (event.key === 'Enter' && event.ctrlKey) {
      event.preventDefault()
      handleSubmit()
    }
  }
}

function handleStop() {
  if (loading.value) {
    controller.abort()
    loading.value = false
  }
}

// 可优化部分
// 搜索选项计算，这里使用value作为索引项，所以当出现重复value时渲染异常(多项同时出现选中效果)
// 理想状态下其实应该是key作为索引项,但官方的renderOption会出现问题，所以就需要value反renderLabel实现
const searchOptions = computed(() => {
  if (prompt.value.startsWith('/')) {
    return promptTemplate.value.filter((item: { key: string }) => item.key.toLowerCase().includes(prompt.value.substring(1).toLowerCase())).map((obj: { value: any }) => {
      return {
        label: obj.value,
        value: obj.value,
      }
    })
  }
  else {
    return []
  }
})

// value反渲染key
const renderOption = (option: { label: string }) => {
  for (const i of promptTemplate.value) {
    if (i.value === option.label)
      return [i.key]
  }
  return []
}

const placeholder = computed(() => {
  if (isMobile.value)
    return t('chat.placeholderMobile')
  return t('chat.placeholder')
})

const buttonDisabled = computed(() => {
  return loading.value || !prompt.value || prompt.value.trim() === '' || uuid == ''
})

const footerClass = computed(() => {
  let classes = ['p-4']
  if (isMobile.value)
    classes = ['sticky', 'left-0', 'bottom-0', 'right-0', 'p-2', 'pr-3', 'overflow-hidden']
  return classes
})

onMounted(() => {
  scrollToBottom()
  if (inputRef.value && !isMobile.value)
    inputRef.value?.focus()
})

onUnmounted(() => {
  if (loading.value)
    controller.abort()
})

const fileSrc = computed(() => chatStore.getFileSrcByUuid(+uuid))

function chatDivStyle() {
  if (fileSrc.value != null)
    return 'grid grid-cols-2 w-full h-full overflow-hidden'

  else
    return 'grid w-full h-full overflow-hidden'
}
</script>

<template>
  <ChatLayout>
    <div class="flex flex-col w-full h-full">
      <HeaderComponent
        v-if="isMobile"
        :using-context="usingContext"
        @export="handleExport"
        @handle-clear="handleClear"
      />
      <div :class="chatDivStyle()">
        <main class="flex-1 overflow-hidden">
          <div id="scrollRef" ref="scrollRef" class="h-full overflow-hidden overflow-y-auto">
            <div
              id="image-wrapper"
              class="w-full max-w-screen-xl m-auto dark:bg-[#101014]"
              :class="[isMobile ? 'p-2' : 'p-4']"
            >
              <template v-if="!dataSources.length">
                <div class="flex items-center justify-center mt-4 text-center text-neutral-300">
                  <SvgIcon icon="ri:bubble-chart-fill" class="mr-2 text-3xl" />
                  <span>{{ t('chat.newChatTitle') }}</span>
                </div>
              </template>
              <template v-else>
                <div>
                  <Message
                    v-for="(item, index) of dataSources"
                    :key="index"
                    :date-time="item.dateTime"
                    :text="item.text"
                    :inversion="item.inversion"
                    :error="item.error"
                    :loading="item.loading"
                    @regenerate="onRegenerate(index)"
                    @delete="handleDelete(index)"
                  />
                  <div class="sticky bottom-0 left-0 flex justify-center">
                    <NButton v-if="loading" type="warning" @click="handleStop">
                      <template #icon>
                        <SvgIcon icon="ri:stop-circle-line" />
                      </template>
                      {{ t('common.stopResponding') }}
                    </NButton>
                  </div>
                </div>
              </template>
            </div>
          </div>
        </main>
        <div v-if="fileSrc != null">
          <iframe class="w-full h-full" :src="fileSrc" />
        </div>
      </div>
      <footer :class="footerClass">
        <!-- <div class="w-full max-w-screen-xl m-auto"> -->
        <div class="flex items-center justify-between space-x-2">
          <HoverButton v-if="!isMobile" @click="handleClear">
            <span class="text-xl text-[#4f555e] dark:text-white">
              <SvgIcon icon="ri:delete-bin-line" />
            </span>
          </HoverButton>
          <HoverButton v-if="!isMobile" @click="handleExport">
            <span class="text-xl text-[#4f555e] dark:text-white">
              <SvgIcon icon="ri:download-2-line" />
            </span>
          </HoverButton>
          <HoverButton @click="toggleUsingContext">
            <span class="text-xl" :class="{ 'text-[#4b9e5f]': usingContext, 'text-[#a8071a]': !usingContext }">
              <SvgIcon icon="ri:chat-history-line" />
            </span>
          </HoverButton>
          <NSelect v-model:value="modelname" :options="options" style="width: 9vw;" />
          <NAutoComplete v-model:value="prompt" :options="searchOptions" :render-label="renderOption">
            <template #default="{ handleInput, handleBlur, handleFocus }">
              <NInput
                ref="inputRef"
                v-model:value="prompt"
                type="textarea"
                :placeholder="placeholder"
                :autosize="{ minRows: 1, maxRows: isMobile ? 4 : 8 }"
                @input="handleInput"
                @focus="handleFocus"
                @blur="handleBlur"
                @keypress="handleEnter"
              />
            </template>
          </NAutoComplete>
          <NButton type="primary" :disabled="buttonDisabled" @click="handleSubmit">
            <template #icon>
              <span class="dark:text-black">
                <SvgIcon icon="ri:send-plane-fill" />
              </span>
            </template>
          </NButton>
        </div>
        <!-- </div> -->
      </footer>
    </div>
  </ChatLayout>
</template>
